Interdental brush



FIG. 1 is a perspective view of an interdental brush according to the present design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines showing of parts of the drawing are for the purpose of illustrating use and form no part of the claimed design. 

CLAIM The ornamental design for an interdental brush, as shown and described. 